We have a Universal Distribution Group entry with an email address - we call it
This item has two members [we call them
MemberB] which receive in their inbox emails sent to
firstname.lastname@example.org. That far this works perfectly for years.
When for example
MemberA wants to reply to an email sent to
email@example.com [which has been delivered into his
Inbox] then I have to change the sender address in the
From field [
firstname.lastname@example.org is selected from the place displayed as red box]:
Since couple of weeks [I suspect a Microsoft update] I have this very weird behavior:
Very often, too often, the email is rejected by our Exchange with the name of the recipient and that I am not allowed to send on behalf of an other user - but we are not sending it
on behalf of!
When we go to the
Sent Items folder, press
Forward Email, select
email@example.com in the
From field then it works!
Here two screenshots how it appears in the
Sent Items box:
1) The first try when the email gets rejected. It is in German but you can see it has been sent
on behalf of.
And then few seconds later, with exactly the same procedure and same data the email can be sent - you see the
on behalf of is missing and therefore it works.
Note: I replaced in the screenshots the real content with samples so it is more understandable.
What confuses me totally is, that mostly the first time the email tries to be sent
on behalf of and then few seconds later not.
What can I do to disable/avoid the
on behalf of mechanism?
- Exchange 2010
- SBS 2011 Standard
- Outlook 2013
Replies to comments:
- A shared mailbox isn't option.
- Cache mode is disabled.
- SBS has been restarted several times.
- For the both users
MemberBsend on behalf is set in the distribution group for